最近学习Mule时遇到一个问题，场景如下，通过公开的Web Service（代码中的TestWS），接受请求参数，使用自定义的Transformer将参数转成访问另一Web Service（代码中的TestWSInterface ）的请求参数。

出现以下异常:

Exception stack is:
1. argument type mismatch (java.lang.IllegalArgumentException)
  sun.reflect.NativeMethodAccessorImpl:-2 (null)
2. Failed to route event via endpoint: DefaultOutboundEndpoint{endpointUri=http://localhost:8082/testws/ws/TestWSInterface, connector=CxfConnector{this=c91629, started=true, initialised=true, name='connector.cxf.0', disposed=false, numberOfConcurrentTransactedReceivers=4, createMultipleTransactedReceivers=true, connected=true, supportedProtocols=[cxf, cxf:http, cxf:https, cxf:jms, cxf:vm], serviceOverrides=null}, transformer=[], name='endpoint.http.localhost.8082.testws.ws.TestWSInterface', properties={wsdlLocation=classpath:TestWSInterface.wsdl, operation=testBean, wsdlPort=TestWSImplPort, enableMuleSoapHeaders=true, clientClass=jame.test.ws.TestWSImplService, applyTransformersToProtocol=true}, transactionConfig=Transaction{factory=null, action=NEVER, timeout=0}, filter=null, deleteUnacceptedMessages=false, securityFilter=null, synchronous=true, initialState=started, responseTimeout=10000, endpointEncoding=UTF-8}. Message payload is of type: Stu (org.mule.api.transport.DispatchException)
  org.mule.transport.AbstractMessageDispatcher:185 (http://www.mulesource.org/docs/site/current2/apidocs/org/mule/api/transport/DispatchException.html)

-----------------------------

实际要访问的接口和实现类

@WebService
public interface TestWSInterface {

    MyBean testBean(@WebParam(name="newBean")NewBean newBean);
}

@WebService(endpointInterface = "com.aaa.test.ws.TestWSInterface")
public class TestWSImpl implements TestWSInterface {  
   
    public MyBean testBean(NewBean newBean){
        System.out.println(newBean.getId());
        System.out.println(newBean.getAdd());
       
        MyBean my = new MyBean();
        my.setAge(20);
        my.setName("MyBean");
       
        return my;
    }

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MULE接收请求参数的接口和实现类

@WebService
public interface TestWS {

    @WebResult(name="outStu")
    public Stu test(@WebParam(name="inStu")Stu stu);
}

@WebService(serviceName="TestWSService", endpointInterface="com.aaa.mule.test.ws.TestWS")
public class TestWSImpl implements TestWS {

    public Stu test(Stu stu) {
        System.err.println(stu.getAge());
        System.err.println(stu.getName());
       
        return stu;
    }

}

-----------------------------

自定义的Transformer

public class CxfTestTransformer extends AbstractTransformer{
   
    public CxfTestTransformer(){       
        super();
        this.registerSourceType(Stu.class);
        this.setReturnClass(NewBean.class);
    }

    @Override
    protected Object doTransform(Object src, String encoding)
            throws TransformerException {
        System.out.println(src);
        NewBean newBean = new NewBean();
       
        newBean.setAdd("aaa");
        newBean.setId("111");
        return newBean;

   }

}

-----------------------------

mule-config.xml

<model name="echoSample">   
        <service name="TestWS">
            <inbound>
                <cxf:inbound-endpoint address="http://localhost:65082/services/TestWS"/>
            </inbound>
            <component>               
                <singleton-object class="com.aaa.mule.test.ws.TestWSImpl"/>
            </component>
            <outbound>
                              <pass-through-router>
                       <cxf:outbound-endpoint
                         address="http://localhost:8082/testws/ws/TestWSInterface"
                         clientClass="com.aaa.test.ws.TestWSImplService"
                         wsdlPort="TestWSImplPort"
                         wsdlLocation="classpath:TestWSInterface.wsdl"
                         operation="testBean">
                       </cxf:outbound-endpoint>

<custom-transformer class="com.aaa.mule.test.ws.filter.CxfTestTransformer"></custom-transformer>
                    </pass-through-router>                    

             </outbound>
        </service>
    </model>

-----------------------------

参考了以下文档

http://www.mulesoft.org/documentation/display/MULE2USER/Using+a+Web+Service+Client+as+an+Outbound+Endpoint

clientClass="com.aaa.test.ws.TestWSImplService"为使用 WSDL to Java tool生成的客户端类。

望各位能帮忙解决。